[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100633707":3},{"organization":4,"armGroups":7,"interventions":35,"overallOfficials":34,"centralContacts":51,"locations":57,"responsibleParty":70,"collaborators":73,"id":76,"slug":77,"hasResults":78,"nctId":79,"briefTitle":80,"officialTitle":81,"acronym":82,"eligibilityCriteria":83,"healthyVolunteers":84,"sex":85,"minAge":86,"maxAge":34,"enrollmentInfo":87,"targetDuration":34,"studyType":90,"phases":91,"briefSummary":93,"conditions":94,"keywords":96,"overallStatus":101,"whyStopped":34,"lastUpdateSubmitDate":102,"lastUpdatePostDateStruct":103,"startDateStruct":106,"completionDateStruct":108,"leadSponsor":110,"locationsCount":111},{"fullName":5,"class":6},"Inonu University","OTHER",[8,14,20,25,30],{"label":9,"type":10,"description":11,"interventionNames":12},"Placebo","PLACEBO_COMPARATOR","Participants receive placebo condition.",[13],"Dietary Supplement: Placebo",{"label":15,"type":16,"description":17,"interventionNames":18},"L-tyrosine","EXPERIMENTAL","Participants receive L-tyrosine condition.",[19],"Dietary Supplement: L-Tyrosine",{"label":21,"type":16,"description":22,"interventionNames":23},"Caffeine","Participants receive caffeine condition.",[24],"Dietary Supplement: Caffeine",{"label":26,"type":16,"description":27,"interventionNames":28},"Combined","Participants receive combined supplementation condition.",[29],"Dietary Supplement: L-tyrosine + Caffeine",{"label":31,"type":32,"description":33,"interventionNames":34},"Control","NO_INTERVENTION","Participants complete the experimental protocol without receiving placebo or active supplementation. Baseline cognitive, physiological, and physical performance assessments are performed under the control condition.",null,[36,40,44,47],{"type":37,"name":9,"description":38,"armGroupLabels":39,"otherNames":34},"DIETARY_SUPPLEMENT","Placebo solution matched in taste and volume to active supplements.",[9],{"type":37,"name":41,"description":42,"armGroupLabels":43,"otherNames":34},"L-Tyrosine","L-tyrosine at 150 mg\u002Fkg body weight administered 60 minutes before exercise.",[15],{"type":37,"name":21,"description":45,"armGroupLabels":46,"otherNames":34},"Caffeine at 5 mg\u002Fkg body weight administered 60 minutes before exercise.",[21],{"type":37,"name":48,"description":49,"armGroupLabels":50,"otherNames":34},"L-tyrosine + Caffeine","Combined L-tyrosine (150 mg\u002Fkg) and caffeine (5 mg\u002Fkg) administered 60 minutes before exercise.",[26],[52],{"name":53,"role":54,"phone":55,"phoneExt":34,"email":56},"Halil UÇAR","CONTACT","+90 5462921133","halil.ucar@inonu.edu.tr",[58],{"facility":59,"status":34,"city":60,"state":34,"zip":34,"country":61,"countryCode":34,"cosmosGeoPoint":62,"geoPoint":67,"contacts":68},"Ataturk University Faculty of Sport Sciences","Erzurum","Turkey (Türkiye)",{"type":63,"coordinates":64},"Point",[65,66],41.27694,39.90861,{"lat":66,"lon":65},[69],{"name":53,"role":54,"phone":55,"phoneExt":34,"email":56},{"type":71,"investigatorFullName":53,"investigatorTitle":72,"investigatorAffiliation":5,"oldNameTitle":34,"oldOrganization":34},"PRINCIPAL_INVESTIGATOR","Research Assistant and PhD Student",[74],{"name":75,"class":6},"Ataturk University","100633707","effects-of-l-tyrosine-and-caffeine-on-performance-in-elite-boxers-100633707",false,"NCT07530185","Effects of L-Tyrosine and Caffeine on Performance in Elite Boxers","Effects of L-Tyrosine and Caffeine Supplementation on Cognitive, Physical, and Physiological Parameters in Elite Boxers: A Randomized Double-Blind Placebo-Controlled Crossover Study","TYCAF-BOX","Inclusion Criteria:\n\nMale elite boxers aged ≥18 years At least 8 years of boxing training experience Active participation in national or international competitions Regular training schedule No injury or illness affecting performance\n\nExclusion Criteria:\n\nUse of nutritional supplements or stimulants within the last 4 weeks Any cardiovascular, metabolic, or neurological disorder Current injury or musculoskeletal limitation Smoking or excessive caffeine intake Failure to comply with study procedures",true,"MALE","18 Years",{"count":88,"type":89},18,"ESTIMATED","INTERVENTIONAL",[92],"NA","Participants will complete six sessions, including one familiarization and baseline session followed by five experimental conditions: control (no supplementation), placebo, L-tyrosine, caffeine, and combined L-tyrosine plus caffeine. The experimental conditions will be performed in a randomized, counterbalanced crossover design with a washout period of at least 72 hours between sessions. Resting physiological and cognitive assessments will be performed during the familiarization session, while biochemical, cognitive, and boxing-specific performance assessments will be conducted before and after each experimental session.",[95],"Sports Performance",[15,21,97,98,99,100],"Boxing","BDNF","Cognitive performance","Anaerobic performance","NOT_YET_RECRUITING","2026-07-06",{"date":104,"type":105},"2026-07-08","ACTUAL",{"date":107,"type":89},"2026-09",{"date":109,"type":89},"2027-03",{"name":5,"class":6},1]